diff --git a/css/style.css b/css/style.css
index 12032b7a..eaaf70de 100644
--- a/css/style.css
+++ b/css/style.css
@@ -295,6 +295,10 @@ section.ucb-main-nav-section {
   .page-header {
     box-shadow: 0 2px 5px rgba(0 0 0 / 10%);
   }
+
+  .ucb-main-nav-container {
+    flex-direction: column;
+  }
 }
 
 /*********** Intro Wide **************/
diff --git a/css/ucb-menu.css b/css/ucb-menu.css
index dc51163a..d4410c9a 100644
--- a/css/ucb-menu.css
+++ b/css/ucb-menu.css
@@ -363,6 +363,15 @@
   .ucb-secondary-menu-region-container #block-boulder-base-secondary-menu {
   width: 100% !important;
   }
+
+  .ucb-main-nav-container .ucb-menu .expanded.active > a.nav-link,
+  .ucb-main-nav-container .ucb-menu .expanded.active > .ucb-menu {
+    border-left: none;
+  }
+
+  .ucb-main-nav-container .ucb-menu .expanded.active > .ucb-menu {
+    display: none;
+  }
 }
 
 .ucb-footer-menu-region .block-menu-blocksocial-media-menu,